Part Numbering

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Ball Bearing - NMB Part Numbering System

BEARING PART NUMBER BEARING SPEC. BASIC BEARING NUMBER BASIC BEARING SUFFIX DIMENSIONAL ACCURACY SPEC. LUBRICANT SPEC. 1 2 3 4 5 6 7 8 9 10 RING & BALL MATERIAL BEARING  SERIES SIZE REF. ENCLOSURE SPECIAL FEATURE / NOISE GRADE RETAINER PRECISION    GRADE CLEARANCE LUBRICANT      TYPE LUBRICANT FILL QTY. DD R- 1560 ZZ MT R P0 P25 LY121 L No Code SUJ2 or equivalent (e.g. AISI52100) DD NMB developed stainless steel KK NMB developed high carbon chromium steel Radial Ball Bearing Thrust Series Metric Series Inch Series T- R-Thick Section RI- L-Thin Section RIF-Flanged Special Series A-Extra Thin Section ZB- RF-Flanged Thick Section AS- LF-Flanged Thin Section RO- AF-Flanged Extra Thin Section NR-Snap Ring on Outer Ring O.D. The Size Ref. is created from the dimensions of the Bore and Outside Diameter. e.g. R-1560 O.D. 15mm; Bore 6.0mm RI-418 O.D. is the numerator of 4/16" Bore 1/8"   X Code of bearing internal design Z Removable shield, snap ring type H Non-removable shield, stamped type S Rubber seal, non-contact D Rubber seal, contact K Non-removable shield, stamped type     Indicate same code twice when both sides are to be enclosed. W Wider width than standard Y Thinner width than standard SD Special design No code Standard noise grade MT Extremely noise sensitive application GT Hard Disk Drive spindle motors R Steel Ribbon Type H Steel Crown Type MN Molded Nylon Crown Type JIS Grade; P0 JIS Grade 0 P5 JIS Grade 5 ABMA Grade; A3 ABEC 3P A5 ABEC 5P PXX Radial Clearance Denotes the upper and lower limits of the radial clearance in 0.0001". (Example) When the clearance is 5µm -12.5µm, it is 0.0002"-0.0005" and mentioned as P25. LO Oil LG Grease LY Oil or Grease LD No Lubricant No Code   25vol% - 35vol% X     5vol% - 10vol% L   10vol% - 15vol% T   15vol% - 20vol% H   40vol% - 50vol% J   50vol% - 60vol% F 100vol% Note :Some miniature size bearings have a slightly adjusted grease quantity than above.